This model has been used by many since 1965, so much so that it seems to be more common sense than a theory. I think it is a good model to follow. It addresses the process needed to get tasks done in a group. In groups, if one were to follow this, I believe that the group as a whole would benefit. If used properly, the model can help prevent conflict and confusion on roles and everything as a whole.
J Welch ans S Welch, "From the Old, Something New," BusinessWeek, p 124